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The hacks can affect the underlying structure of the device. There is no single location for them. Checking that is the complete list you installed might not be a bad idea.
Also a complete restart - holding down power for 20 seconds - and trying again would not go amiss. Other than that I am out of ideas. Perhaps someone can point you at a log that would tell you more.
FWIW. the screensavers, jailbreak, usbnetworking, fonts all did not affect the update of a 3.2.1 to 3.3 - even installed. I can attest to that.
HTH
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